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|
/* LIBDGL -- a Directed Graph Library implementation
* Copyright (C) 2002 Roberto Micarelli
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* best view tabstop=4
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "opt.h"
static int _ParseLongOption(GnoOption_s * pOpt, char *pszArg)
{
char *pszLong;
char *pszPar;
char *pszMatch = NULL;
int nret;
if (pOpt->pszLong == NULL) {
return 0;
}
pszLong = strdup(pOpt->pszLong);
if ((pszPar = strchr(pszArg, '=')) != NULL) {
*pszPar = 0;
}
pszMatch = strdup(pszArg);
if (pszPar)
*pszPar++ = '=';
if (strcmp(pszLong, pszMatch + 2) == 0) {
/* * mandatory parameter not found
* */
if (pszPar == NULL) {
nret = -1;
goto free_and_exit;
}
if (pOpt->ppszValue) {
if (pOpt->ppszValue[0])
free(pOpt->ppszValue[0]);
pOpt->ppszValue[0] = strdup(pszPar);
}
nret = 1;
goto free_and_exit;
}
nret = 0;
free_and_exit:
free(pszLong);
free(pszMatch);
return nret;
}
static int _ParseLongSwitch(GnoOption_s * pOpt, char *pszArg)
{
if (pOpt->pszLong == NULL) {
return 0;
}
if (strcmp(pOpt->pszLong, pszArg + 2) == 0) {
if (pOpt->pfValue)
*pOpt->pfValue = True;
return 1;
}
return 0;
}
static int _ParseShortOption(GnoOption_s * pOpt, char *pszArg, char *pszPar)
{
char *pszShort;
int ich;
if (pOpt->pszShort == NULL)
return 0;
pszShort = strdup(pOpt->pszShort);
for (ich = 1; pszArg[ich]; ich++) {
if (pszShort[0] == pszArg[ich]) {
if (pszPar == NULL || pszPar[0] == 0) {
free(pszShort);
return -1;
}
if (pszPar[0] == '-' && pszPar[1] != 0) {
free(pszShort);
return -1;
}
if (pOpt->ppszValue) {
if (pOpt->ppszValue[0])
free(pOpt->ppszValue[0]);
pOpt->ppszValue[0] = strdup(pszPar);
}
free(pszShort);
return 2;
}
}
free(pszShort);
return 0;
}
static int _ParseShortSwitch(GnoOption_s * pOpt, char *pszArg)
{
int ich;
if (pOpt->pszShort == NULL)
return 0;
for (ich = 1; pszArg[ich]; ich++) {
if (pOpt->pszShort[0] == pszArg[ich]) {
if (pOpt->pfValue)
*pOpt->pfValue = True;
return 1;
}
}
return 0;
}
/***********************************************************************
* CALLBACKS
**********************************************************************/
/***********************************************************************
* PUBLIC FUNCTIONS
**********************************************************************/
/*@*--------------------------------------------------------------------
* @func: GnoParse()
* @descr: Parse argc, argv against the option array and setup option
* values in the array.
*
* @args: I: argc = count of argv entries
* I: argv -> array of pointer to string
* I: pOpt -> option array pointer
*
* @ret: The number of 'orphan' entries found in the argv.
* @see: GnoOption_s
*
* @notes: The argv array will be modified: each argv entry that contains a
* recognized option ( '-.' or '--...' ) or each entry recognized as
* a parametric option parameter, will be set to NULL.
* Thus, at the function return the argv entries not set to NULL are
* those of orphan entries (those not related to any option).
* The user can then scan argv to find out orphans.
* However the number of argv entries will not be altered.
*
*--------------------------------------------------------------------*/
int GnoParse(int argc, char **argv, GnoOption_s * pOpt)
{
char *pszArgv;
char *pszArgvNxt;
int iArg, iOpt, cOrphan = 0;
int nret, cret;
Boolean fParseError = False;
/* * this first loop setup default values
* * strdup is used for non-switch options
* * to make life easier when freeing the field
* */
for (iOpt = 0; pOpt[iOpt].pszShort || pOpt[iOpt].pszLong; iOpt++) {
if (pOpt[iOpt].nFlg & GNO_FLG_SWITCH) {
if (pOpt[iOpt].pfValue) {
pOpt[iOpt].pfValue[0] = pOpt[iOpt].fDef;
}
}
else {
if (pOpt[iOpt].pszDef) {
if (pOpt[iOpt].ppszValue) {
pOpt[iOpt].ppszValue[0] = strdup(pOpt[iOpt].pszDef);
}
}
else {
if (pOpt[iOpt].ppszValue) {
pOpt[iOpt].ppszValue[0] = NULL;
}
}
}
}
/* * for each arg in argv lookup the matching options
* */
for (iArg = 0, pszArgv = NULL;
iArg < argc && (pszArgv = strdup(argv[iArg])) != NULL;
iArg++, free(pszArgv), pszArgv = NULL) {
if (pszArgv[0] == '-' && pszArgv[1] == '-' && pszArgv[2]) { /* long style */
for (iOpt = 0;
(pOpt[iOpt].pszShort || pOpt[iOpt].pszLong) && argv[iArg];
iOpt++) {
if (pOpt[iOpt].pszLong) {
if (pOpt[iOpt].nFlg & GNO_FLG_SWITCH) {
nret = _ParseLongSwitch(&pOpt[iOpt], pszArgv);
}
else {
nret = _ParseLongOption(&pOpt[iOpt], pszArgv);
}
if (nret < 0) {
fprintf(stderr,
"parse option: syntax error at <%s>\n",
pszArgv);
fParseError = True;
}
if (nret == 1) {
argv[iArg] = NULL;
}
}
}
if (argv[iArg]) {
fprintf(stderr, "parse option: <%s> is out of scope\n",
pszArgv);
fParseError = True;
}
}
else if (argv[iArg][0] == '-' && argv[iArg][1]) { /* short style */
if (iArg + 1 < argc) {
pszArgvNxt = strdup(argv[iArg + 1]);
}
else {
pszArgvNxt = NULL;
}
for (cret = iOpt = 0;
pOpt[iOpt].pszShort || pOpt[iOpt].pszLong; iOpt++) {
if (pOpt[iOpt].pszShort) {
if (pOpt[iOpt].nFlg & GNO_FLG_SWITCH) {
nret = _ParseShortSwitch(&pOpt[iOpt], pszArgv);
}
else {
nret =
_ParseShortOption(&pOpt[iOpt], pszArgv,
pszArgvNxt);
}
if (nret < 0) {
fprintf(stderr,
"parse option: syntax error at <%s>\n",
pszArgv);
fParseError = True;
}
else {
cret = (nret > cret) ? nret : cret;
}
}
}
if (pszArgvNxt) {
free(pszArgvNxt);
}
if (cret == 1) {
argv[iArg] = NULL;
}
else if (cret == 2) {
argv[iArg++] = NULL;
argv[iArg] = NULL;
}
}
else {
cOrphan++;
}
}
if (pszArgv)
free(pszArgv);
return (fParseError == True) ? -1 : cOrphan;
}
/*@*--------------------------------------------------------------------
* @func: GnoFree()
* @descr: Free resource previously created with a call to GnoParse()
*
* @args: I: pOpt -> option array pointer
*
* @see: GnoOption_s, GnoParse()
*
*--------------------------------------------------------------------*/
void GnoFree(GnoOption_s * pOpt)
{
int iOpt;
for (iOpt = 0; pOpt[iOpt].pszShort || pOpt[iOpt].pszLong; iOpt++) {
if (pOpt[iOpt].ppszValue) {
if (pOpt[iOpt].ppszValue[0]) {
free(pOpt[iOpt].ppszValue[0]);
pOpt[iOpt].ppszValue[0] = NULL;
}
}
}
}
/*@*--------------------------------------------------------------------
* @func: GnoHelp()
* @descr: Print a brief option's help on the standard error
*
* @args: I: pszHead -> help header string
*
* @args: I: pOpt -> option array pointer
*
* @see: GnoOption_s
*
*--------------------------------------------------------------------*/
void GnoHelp(char *pszHead, GnoOption_s * pOpt)
{
int iOpt;
fprintf(stderr, "%s\n", (pszHead) ? pszHead : "options");
for (iOpt = 0; pOpt[iOpt].pszShort || pOpt[iOpt].pszLong; iOpt++) {
if (pOpt[iOpt].nFlg & GNO_FLG_SWITCH) {
if (pOpt[iOpt].pszShort) {
fprintf(stderr, "-%s ", pOpt[iOpt].pszShort);
}
if (pOpt[iOpt].pszLong) {
fprintf(stderr, "--%s", pOpt[iOpt].pszLong);
}
fprintf(stderr, "\n\t%s\n", (pOpt[iOpt].pszDescr)
? pOpt[iOpt].pszDescr : "No description available.");
}
else {
if (pOpt[iOpt].pszShort) {
fprintf(stderr, "-%s ", pOpt[iOpt].pszShort);
fprintf(stderr, "<value> ");
}
if (pOpt[iOpt].pszLong) {
fprintf(stderr, "--%s", pOpt[iOpt].pszLong);
fprintf(stderr, "=<value>");
}
fprintf(stderr, "\n\t%s\n", (pOpt[iOpt].pszDescr)
? pOpt[iOpt].pszDescr : "No description available.");
}
}
}
/******************************* END OF FILE **************************/
|
